Propeller blade angle control system
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United States of America Patent
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Oct 6, 2020
Grant Date -
Mar 15, 2018
app pub date -
Jun 2, 2017
filing date -
Sep 12, 2016
priority date (Note) -
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Abstract
A control circuit for changing the angle of propeller blades includes a propeller pitch change mechanism, and a fixed-displacement pump providing the supply of oil from an engine oil return system. A valve has an outlet port to direct oil from a cavity of the valve, and a pitch port in fluid communication with the pitch change mechanism. A spool of the valve is operable between a first position and a second position to respectively open and close the outlet port, and direct oil flow away from or to the pitch change mechanism.
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